This patch introduces handling of ObjC protocols similar to how ObjC
classes work. Since this only works in ObjC++, all declarations
containing ObjC protocols will be protected by the __OBJC__ macro.
This patch results in some `_bridgeObjC` methods being exposed, we might
end up hiding those in the future, but there is no harm having them in
the interop header for the interim period.
rdar://136757913
Previously the code got the declaration for types with generic
arguments and the printer used the declaration. This was a lossy
operation, we printed the type with generic parameters instead of the
arguments. This patch makes sure we print the type with the arguments.
Unfortunately, the code structure is not the most clear, type printing
is currently inherently part of the function signature printing. This
code path needs to be factored out in the future to make the code easier
to understand.
rdar://130679337
The function responsible for printing signatures can return in the middle
of the printing process whenever it discovers an unsupported scenario.
To avoid creating a header that cannot be compiler, this function should
be transactional. It either has to succeed and write the signature to the
stream, or in case it failed, the stream should be untouched. This patch
introduces a temporary buffer that is flushed to the stream as the last
step for a successful execution. This should make the user experience
better whenever the user stumbles upon something that is unsupported.
Reformatting everything now that we have `llvm` namespaces. I've
separated this from the main commit to help manage merge-conflicts and
for making it a bit easier to read the mega-patch.
This is phase-1 of switching from llvm::Optional to std::optional in the
next rebranch. llvm::Optional was removed from upstream LLVM, so we need
to migrate off rather soon. On Darwin, std::optional, and llvm::Optional
have the same layout, so we don't need to be as concerned about ABI
beyond the name mangling. `llvm::Optional` is only returned from one
function in
```
getStandardTypeSubst(StringRef TypeName,
bool allowConcurrencyManglings);
```
It's the return value, so it should not impact the mangling of the
function, and the layout is the same as `std::optional`, so it should be
mostly okay. This function doesn't appear to have users, and the ABI was
already broken 2 years ago for concurrency and no one seemed to notice
so this should be "okay".
I'm doing the migration incrementally so that folks working on main can
cherry-pick back to the release/5.9 branch. Once 5.9 is done and locked
away, then we can go through and finish the replacement. Since `None`
and `Optional` show up in contexts where they are not `llvm::None` and
`llvm::Optional`, I'm preparing the work now by going through and
removing the namespace unwrapping and making the `llvm` namespace
explicit. This should make it fairly mechanical to go through and
replace llvm::Optional with std::optional, and llvm::None with
std::nullopt. It's also a change that can be brought onto the
release/5.9 with minimal impact. This should be an NFC change.
Each emitted declaration is annotated with the external_source_symbol with its own USR, to allow Clang's indexer to recognize this declaration as a Swift declaration with a specific USR
non-throwing functions.
Activating swift-functions-errors tests
Inserting macros and additional parameters in C and C++ functions following the pattern to lowering to LLVM IR.
